United States and its insular territories per the United States Constitution. Since the suspension in 1971 of convertibility of paper U. Bs en iso 11666 pdf free download it is the most used in international transactions, the U. Several countries use it as their official currency, and in many others it is the de facto currency.
Besides the United States, it is also used as the sole currency in two British Overseas Territories in the Caribbean: the British Virgin Islands and Turks and Caicos Islands. A few countries use the Federal Reserve Notes for paper money, while still minting their own coins, or also accept U.